Chicken's egg is called giggle, which is related to the size of the egg.
If we have to struggle with this problem, we can also understand it this way: Pigeons are as big as pigeon eggs. This can explain why eggs are small.
I don't know if the chicken you have seen is a rooster or a hen. If it is a rooster, congratulations: the rooster that lays eggs, the fighter in the rooster. This kind of chicken does exist. Don't let it lay eggs, eat quickly, and then you can lay eggs.
Thank you for your adoption!